// Copyright (c) 2023 Apple Inc. All rights reserved.
//
// @APPLE_OSREFERENCE_LICENSE_HEADER_START@
//
// This file contains Original Code and/or Modifications of Original Code
// as defined in and that are subject to the Apple Public Source License
// Version 2.0 (the 'License'). You may not use this file except in
// compliance with the License. The rights granted to you under the License
// may not be used to create, or enable the creation or redistribution of,
// unlawful or unlicensed copies of an Apple operating system, or to
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//
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// http://www.opensource.apple.com/apsl/ and read it before using this file.
//
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#include <kern/cpc.h>
#include <sys/sysctl.h>
SYSCTL_NODE(_kern, OID_AUTO, cpc, CTLFLAG_RD, 0,
"CPU Performance Counters subsystem");
static int
_cpc_sysctl_secure SYSCTL_HANDLER_ARGS
{
int enforced = cpc_is_secure();
int changed = 0;
int error = sysctl_io_number(req, enforced, sizeof(enforced), &enforced,
&changed);
if (error != 0) {
return error;
}
if (changed) {
#if CPC_INSECURE
cpc_change_security(enforced);
#else // CPC_INSECURE
return EPERM;
#endif // !CPC_INSECURE
}
return 0;
}
#if CPC_INSECURE
#define CPC_SYSCTL_SECURE_PROT CTLFLAG_RW
#else // CPC_INSECURE
#define CPC_SYSCTL_SECURE_PROT CTLFLAG_RD
#endif // !CPC_INSECURE
SYSCTL_PROC(_kern_cpc, OID_AUTO, secure, CPC_SYSCTL_SECURE_PROT | CTLTYPE_INT,
0, 0, _cpc_sysctl_secure, "I",
"Whether the CPU Performance Counters system is operating securely.");